Telephone instrument base



FIG. 1 is a perspective view of a telephone instrument base, showing my new design;

FIG. 2 is a front elevation thereof, of a reduced scale;

FIG. 3 is a side elevation thereof, the opposite side being a mirror image of the side shown, of a reduced scale; and

FIG. 4 is a rear elevation thereof, of a reduced scale. 

The ornamental design for a telephone instrument base, as shown. 